OK, persistance pays off.
Just realised that the central lens element, is attached inside the eyepiece via a three screw method inside. The three screws had loosed and the element was spinning, therefore not allowing the inner thread to be tightened onto the body...
Answer tighten the inner screws and I'm sure it will allow me to screw the eyepieces back on...
Delete this thread please, if you wish..
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